Federal Register #EPA-R02-OAR-2025-0242

EPA Approval of Source-Specific NOx Emission Controls for Castleton Power, LLC

This opportunity concerns the EPA's proposed approval of a source-specific air quality plan for Castleton Power, LLC in New York: - Government Buyer: - Environmental Protection Agency (EPA), Region 2, Air Programs Branch - OEMs and Vendors Mentioned: - Power System Mfg. (Dry Low NOx technology) - Hamon-Deltak (Selective Catalytic Reduction) - Peerless Mfg. Co. (SCR) - Products/Services Requested: - Implementation and operation of steam injection NOx control system for a combined-cycle combustion turbine generator (emission unit 10GTDB) - Continuous emissions monitoring systems (CEMS) for NOx - Semi-annual monitoring and reporting of NOx emissions as per Title V permit conditions - Unique or Notable Requirements: - Only steam injection is deemed technically feasible and cost-effective for NOx control at this facility - Specific NOx emission limits, monitoring, reporting, and recordkeeping are required under Title V permit conditions 30, 31, 32, 35, and 49 - The EPA determined that no additional NOx control technologies are both technically feasible and cost-effective for this emission unit - The plan is designed to ensure compliance with the Clean Air Act and ozone NAAQS requirements

Description

The Environmental Protection Agency (EPA) proposes to approve a revision to New York's State Implementation Plan (SIP) concerning the ozone National Ambient Air Quality Standard (NAAQS) for the Castleton Energy Center. This revision involves a source-specific SIP (SSSIP) for controlling oxides of nitrogen (NOx) emissions from a combined-cycle combustion turbine generator and associated equipment at the facility. The EPA finds the control option to be Reasonably Available Control Technology (RACT) and concludes the action complies with the Clean Air Act and will not interfere with ozone NAAQS requirements. The proposal includes specific emission limits, monitoring, reporting, and recordkeeping requirements as part of the facility's Title V operating permit.

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